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If your computer came pre-built and has a model number, google drivers for this computer and install the sound drivers.

If your computer doesn't have a model number, you'll need to open up the case. Once open, if you have a discrete sound card (it's a card that fits into a slot on the motherboard) you'll need to google the make and model of it and find drivers. If you don't have a discrete card, you'll need to google make and model of the motherboard and find drivers that way.

You need to install the Windows operating system first.
Then you need to check what drivers that are missing or not working.
Then you need to download the drivers for your model laptop. You will need to get onto the Internet from a working computer to do this.
You can go to the Compaq/HP WEB site to download the latest drivers for your model laptop that suit your particular Windows operating system (ie, Windows XP, vista etc.).Go to www.compaq.com